Bazaar is used by some people to maintain distribution packages for Ubuntu, Debian, and other distributions.
Features for packaging
* bzr log lp:python | less shows you all the upstream commits, without needing to find the cvs/svn coordinates, log in, etc. You can then extract diffs, etc
- at the moment only the mainline is available
* bugs can be attached to branches and vice versa
(more to come)